What to know about Nancy Guthrie's kidnapping and the race to find her

It's been a week since “Today” show host Savannah Guthrie 's mother disappeared from her home in Arizona in what authorities say was a kidnapping. Investigators have been examining ransom notes and looking for evidence but have not named a suspect. On Friday, officers returned to 84-year-old Nancy Guthrie 's home near Tucson and to the surrounding neighborhood to continue their search.